[util] Always inline Rc::decRef and Rc::incRef

GCC feels the need to generate functions with two instructions for some
reason. Doesn't meaningfully change performance, but makes profiling a
lot easier in some instances.

src/util/rc/util_rc.h

@@ -2,6 +2,8 @@
 
 #include <atomic>
 
+#include "../util_likely.h"
+
 namespace dxvk {
   
   /**
@@ -15,7 +17,7 @@ namespace dxvk {
      * \brief Increments reference count
      * \returns New reference count
      */
-    uint32_t incRef() {
+    always_inline uint32_t incRef() {
       return ++m_refCount;
     }
     
@@ -23,7 +25,7 @@ namespace dxvk {
      * \brief Decrements reference count
      * \returns New reference count
      */
-    uint32_t decRef() {
+    always_inline uint32_t decRef() {
       return --m_refCount;
     }
     

src/util/rc/util_rc_ptr.h

@@ -102,12 +102,12 @@ namespace dxvk {
     
     T* m_object = nullptr;
     
-    void incRef() const {
+    always_inline void incRef() const {
       if (m_object != nullptr)
         m_object->incRef();
     }
     
-    void decRef() const {
+    always_inline void decRef() const {
       if (m_object != nullptr) {
         if (m_object->decRef() == 0)
           delete m_object;

src/util/util_likely.h

@@ -3,7 +3,9 @@
 #ifdef __GNUC__
 #define likely(x)   __builtin_expect((x),1)
 #define unlikely(x) __builtin_expect((x),0)
+#define always_inline inline __attribute__((always_inline))
 #else
 #define likely(x)   (x)
 #define unlikely(x) (x)
+#define always_inline inline
 #endif